Plug the emails into a mailing solution: aweber, getresponse, etc. Check ToS to make sure they allow adult. I've heard interspire makes an email marketing software that's very popular for any kind of list.
Next, read a book on email copy writing, or give your email to people in the same niche and rip their emails. This will help your stats a lot. Mimic the masters. Even BHW sends their own newsletter every few days selling the trending SEO packages. Mimic it and twist it for what your userbase is interested in.
Find cpa offers. Dating offers. Camsite offers. Revshare, pay per lead, pay per sale. etc. Clickbank even has a few self-help type products to help you get laid. Experiment. You can rotate the offer every email you send to see what earns best then focus on that.
Write up your email which promotes those things and click send.
Get creative.
You can do a 'model of the week' promo for chaturbate's affiliate program for instance.
Rent the list out. Other internet marketers will pay you for a shoutout where you plug their site/service. A sales thread here might be a good starting point, there's a lot of adult marketers. You'll need a Jr Vip membership and pay a fee.
Since you're in the snapchat niche, here's a potential gold mine.
Find girls who sell their snap usernames at a premium. Contact them saying you have a list of 30k guys who love snapchat babes. Sell the girls a shoutout on your list where they can promote their premium username.
The girls will get real people buying their username. You get paid for providing marketing services to the girls. Your list benefits by getting real snapchat girls, as oppose to all the fake spammers that exist on the platform.
If you're stuck on 'how do I price this', find a girl, it could even be yourself to keep it all in-house. Do a shoutout for the username. On snapchat, post the snaps a usual girl posts when she is selling a premium username. Add up all the revenue you get. That's your estimate for what the girls will earn who buy your shoutouts. Charge a number you deem fair based on the earnings.
Girls do a lot of upsells by selling things like panties, socks, phone numbers, or receiving gifts to their amazon wishlist too. I've seen some start doing monthly subscription fee's for access to their username. It's another thing to think about for crafting your sales pitch//determining price.